All tools · page 93

Check which certificate authorities a domain authorizes.

Check DNSSEC status and validation results where available.

Calculate remaining cache time from a supplied DNS TTL and timestamp.

Demonstrate how DNS caching affects record updates.

Compare answers returned by selected DNS resolvers.

Measure DNS lookup latency using a selected resolver.

Retrieve public IP information from a supplied address.

Validate IPv4 address notation.

Validate IPv6 address notation.

Expand compressed IPv6 addresses.

Retrieve registration information for an IP address where available.

Retrieve domain registration information from available sources.

Find the recorded domain creation date where available.

Inspect reported domain expiration dates.

Identify the registrar associated with a domain.

Check whether an IP appears on selected public blocklists.

Review available reputation signals for a domain.

Calculate subnet addresses, masks, and usable host ranges.

Summarize multiple IPv4 networks into broader CIDR blocks.

Allocate variable-length subnets according to host requirements.

Identify overlapping subnets in a network plan.

Organize IP ranges for departments, servers, and network segments.

Calculate fragment sizing for a supplied packet and MTU.

Estimate packet payload limits from a selected MTU.